Improvement in artificial-stone compounds



106. COMPOSITlONS,

COATING OR PLASTIC.

UNITED STATES PATENT OFFICE.

GEORGE A. GOODRIOH AND FLETCHER SPAIN, OF NEWTON, IOWA.

IMPROVEMENT IN ARTIFICIAL-STONE COMPOUNDS.

Specification forming part of Letters Patent No. 196,219, dated October 16,1877 application filed August 27, 1877. 4

To all whom it my camera:

Be it known that we, GEO. A. GOODRICH and FLETCHER llL SPAIN, of Newton, in the count; of Jasper and State of Iowa, have iuvented certain new and useful Improvements in Artificial Stone; and we do hereby declare the following to be a full, clear, and exact description of I the invention, such as will enable others skilled in the art to which it pertains to make and use it.

Our invention relates to a process for making artificial stone; and it consists in the use of tar-waterin mixing the cement and sand together, as will be more fully described hereinafter.

-In making stone, we take one gallon, more or less, of fresh coal-tar and thoroughly mix it with about tw ep yt fiinesmas much water. This mixture is left standing for tweim hours, when the water is strained, so as to take out all the floating particles of tar. This tar- Ttater'isthen used in'mixing the cement and sand together.

In making stone we use either Portland or En lish cement and common ri\"e'r-sand nil vary tlieir pro portions according to re 'ind of stone we push to make. For a fine quality of stone, we use more cement and less sand; for a poorer quality, we use more sand and less cement.

of any desired shape and pounded or pressed solid, and then, after it is taken from the molds, the stone is allowed to harden for three or four days, when it is ready for use.

By thus using tar-water, instead of tar itself, as has heretofore been the case, we not only are enabled to use a smaller quantity of the tar, but the mixture is more firmly impregnated with the tar, and we produce a harder, finer, and better quality of sandstone than .where the tar itself is used.

Having thus described our invention, we claim- In the process of making artificial stone, tarwater for the purpose of mixing and as meat, or their equivalent substances, substantially as described.

. In testimony that we claim the foregoing we have hereunto set our hands this 20th day of August, 187 7 GEO. A. GOODRIOH. F. M. SPADI.

Witnesses as to G.-A. Goodrich:

. E. E. HUGHES,

HUGH INEWELL. Witnesses as to F. M. Spain:

A. (J. MERsHoN,

J. B. EGEBLY.

After mixing, the mixture is put into molds 

